We select a sample of ∼4200 traditionally defined broad absorption line quasars (BALQs) from the Fifth Data Release quasar catalog of the Sloan Digital Sky Survey. For a statistically homogeneous quasar sample with 1.7 < z < 4.2, the BAL quasar fraction is ∼14% and is almost constant with redshift. We measure the autocorrelation of non-BAL quasars (non-BALQs) and the cross-correlation of BALQs with non-BALQs using this statistically homogeneous sample, both in redshift space and using the projected correlation function. We find no significant difference between the clustering strengths of BALQs and non-BALQs. Assuming a power-law model for the real space correlation function ξ(r) = (r/r0)-1.8, the correlation length for non-BALQs is r0 = 7.6 ± 0.8 h-1 Mpc; for BALQs the cross-correlation length is r0 = 7.4 ±1.1 h-1 Mpc. Our clustering results suggest that BALQs live in similar large-scale environments to non-BALQs.
All Science Journal Classification (ASJC) codes
- Astronomy and Astrophysics
- Space and Planetary Science